I don't have Python on my computer. Can I still run a ShotFactory?
Failed to load preset.
The best solution on Linux or Mac OS is to create a simple shell script with your desired options, make it executable (chmod a+x), put it somewhere on your PATH and then use the name of the shell script as the browser command.
You must specify a numeric request group ID.
Not everybody has a farm of legacy machines with older OSes and browsers. There are online services that offer screenshots of websites in different browsers for considerable fees. For the hobbyist and for open source projects, these fees may be prohibitive.